Patent GB-652461-A (GB)
Title: Improvements in or relating to door assemblies
IPC: B66B13/12
Filed: 1948-08-12
Abstract: 652,461. Doors, &c., operating appliances; fastenings.. WESTINGHOUSE ELECTRIC INTERNATIONAL CO, Aug. 12. 1948. No. 21296. Convention date, Sept. 27, 1947: [Classes 44 and 65(i)] [Also in Group XXX] The initial rotation of a door operating member in the opening or closing direction of the doors imparts through a slip coupling a rotation through a relatively short distance to a door movement control member which operates translating means in the door mechanism, the slip coupling allowing continued rotation of the door operating member after rotation of the control member is completed. The doors 5, 7 of a lift cage 1, Fig. 1 slide by means of rollers 11, 17 on a guide 13 and, when opposite a floor, are coupled to the floor doors 49, 51, Fig. 2, by means of a vane 83 on cage door 7 entering a grooved block 81 on the floor door 49. Doors 49 and 51 also run by means of rollers 55, 61 on a guide 57 and are coupled to open and close simultaneously by means of cables 67, 69 passing over pulleys 63, 65. A spring 77 and links 71, 73 assist closure of these doors. The cage doors are opened and closed by rotation of an arm 39 Fig. 1 through a link 37 and levers 19, 27 pivoted respectively at 21, 29 and interconnected by a link 35, arm 39 being mounted on a shaft 41 driven by a motor 43 on the cage roof. The floor doors are simultaneously opened and closed by coupling vane 83. An arm 147. freely mounted on shaft 41, is caused to move between stops 149, 151 during the initial movements of arm 39 in either direction from each of its limiting positions 39, 39a, by means of a slip coupling, Fig. 6, between the two arms, wherein the boss of arm 147 forms the centre plate between the boss of arm 39 and a ring 161, pressed towards arm 39 by a spring 157. Linings M are provided between the slipping surfaces. Arm 147 is linked to a bell crank 141, in turn connected by a link 137 to a cam 131, supported on the cage so as to contact and move at each floor of the lift a roller 93 on an arm 91 on a long shaft 89, Fig. 2, supported on the lift shaft along the tops of the floor doors. This operates a latch 87 which may comprise one or two latch levers 85 pivoted on door 49, and provided with an emergency release arm A. In either form of latch the levers are released by a pin 117 on shaft 89, Fig. 5, moving a lever 107 pivoted at 109 so as to raise its other end 111 to lift respective lips 105, 101 of, in this case, two latch levers, to raise the lips clear of a rib 103. Thus when arm 39 commences to open the doors the latch levers are raised clear of rib 103. Since there is a slight movement of the door the final locking lip 105 is beyond the rib 103 a short distance when the doors are shut. Similarly, as the doors commence to shut the end 111 of lever 107 drops to allow latching. Preferably two latch levers are used each having an integral plate 121 which works switch 129 or 165 respectively, connected in the circuit shown, Fig. 9, with the main hoist control switch C.S. of the lift, so as to prevent hoisting until either one or both latches drop behind rib 103, manual switch 171 selecting the alternatives. The two latches are of different lengths so that the cage can thus be hoisted when the door is completely closed or when within an inch or two of being closed, as desired. Alternatively one latch 85c, Fig. 10, may fulfil the purpose of the two latches 85 by having a step 105c in addition to a lip 101c, the integral member 121c operating the switches 129c, 165c corresponding to switches 129, 165 in turn.